Helen Seward Mediter Bio Performance 100% vegan natural haircare products. This hair products line is a perfect combination of luxury, effectiveness and ethics, giving your hair the care it deserves while contributing to a more sustainable planet. When you choose Helen Seward Mediter Bio Performance, you are not only choosing high-quality hair care, but also a conscious lifestyle. Moreover, a whopping 95% of the ingredients are from natural sources, meaning your hair is cared for with the power of nature, without harmful chemicals.